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Wc-co-cr thermal spray powder and its preparation method and use

A technology of thermal spraying powder, wc-co-cr, which is applied in the direction of coating, molten spraying, metal material coating process, etc., can solve the problem that the coating density, toughness and corrosion resistance index are not easy to meet the requirements, and the sealing surface is safe There are no reliable guarantees for safety, low product qualification rate and other problems, and the effects of good fluidity, good particle strength and low cost are achieved.

Active Publication Date: 2015-08-19
GANZHOU ACHTECK TOOL TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, when using conventional WC-10Co4Cr thermal spraying powder to prepare sealing surface coatings, due to the coating’s compactness, toughness, and corrosion resistance indicators are difficult to meet the requirements, the product qualification rate has not been high, and the safety of the sealing surface in use is also low. no guarantee
[0004] Therefore, the current WC-Co-Cr thermal spray powder still needs to be improved

Method used

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  • Wc-co-cr thermal spray powder and its preparation method and use
  • Wc-co-cr thermal spray powder and its preparation method and use
  • Wc-co-cr thermal spray powder and its preparation method and use

Examples

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Effect test

Embodiment 1

[0052] With reference to the above-mentioned general method in this embodiment, taking the production of 200kg spray powder as an example, the WC-Co-Cr thermal spray powder of the present invention is prepared according to the following process steps:

[0053] Among them, the ratio of raw materials and corresponding parameters are shown in the table below.

[0054]

[0055] Note: BET: refers to the BET test method, that is, the BET specific surface area test method, where the specific surface area refers to the total area of ​​a unit mass of material. In the above table, the BET value measured by the BET test method is used to characterize the particle size of the nano-tungsten carbide with spherical porous structure used in the present invention.

[0056] FSSS: The abbreviation of Fischer particle size test, the basic method is the steady flow air permeation method, that is, the specific surface area and average particle size are measured under the condition of constant ai...

Embodiment 2

[0093] Taking the production of 200kg spray powder as an example, prepare the WC-Co-Cr thermal spray powder of the present invention according to the method described in Example 1, wherein the difference from Example 1 is that it has the raw material ratio shown in the following table And the corresponding parameters; the sintering temperature is 1150°C (one zone), 1200°C (two and three zones). In this way, the final product WC-Co-Cr thermal spraying powder is prepared, and the particle size specification is 55kg of 5-30 microns, 140kg of 15-53 microns, and the metal loss is about 5kg (2.5%) during the production process. The bulk density of the powder Respectively: 5-30 micron WC-Co-Cr thermal spray powder, 5.5-6.0g / cm 3 ; 15-53 micron WC-Co-Cr thermal spray powder, 4.2-4.7g / cm 3 .

[0094]

[0095] Then, the performance of the new WC-Co-Cr thermal spray powder prepared above was tested and evaluated in combination with the visual observation and the performance test aft...

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Abstract

The utility model discloses a WC-Co-Cr thermal spraying powder and its preparation method and an application thereof. The WC-Co-Cr thermal spraying powder comprises: by weight, 86 parts of a tungsten carbide mixture, 9.8-10.2 parts of cobalt, 4.0 parts of chromium, 0.3-0.6 parts of titanium carbide and 0.3 parts of an anti-oxidant, wherein the tungsten carbide mixture comprises: by weight, 13.2-25.6 parts of tungsten carbide with the granularity of 0.05-0.2 micrometer, 15.0-31.5 parts of tungsten carbide with the granularity of 1.0-2.5 micrometer and 24.5-65 parts of tungsten carbide with the granularity of 4.5-9.0. The WC-Co-Cr thermal spraying powder provided by the invention has excellent toughness and corrosion resistance and can be used to effectively improve compactness of a coating which has been undergone thermal spraying. Thus, the WC-Co-Cr thermal spraying powder can be effectively used in preparation of a super-high pressure sealing and corrosion-resistant coating.

Description

technical field [0001] The invention relates to the technical field of thermal spraying, in particular to the technical field of thermal spraying powder preparation. In particular, the present invention relates to WC-Co-Cr thermal spray powder for preparing ultra-high pressure sealing and corrosion-resistant coatings and a preparation method thereof. Background technique [0002] Thermal spraying technology is a key technology in the field of surface modification. By preparing a layer of wear-resistant coating on the surface of the processed workpiece, the wear resistance and corrosion resistance of the workpiece can be greatly improved. As a wear-resistant and corrosion-resistant coating, thermal sprayed WC / Co coating is widely used in aerospace, metallurgy, machinery and other fields due to its high hardness and good toughness. Compared with electroplating hard chromium layer, thermal spraying WC / Co coating has obvious advantages in wear resistance, corrosion resistance, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C23C4/06C22C29/08
Inventor 王韶毅杨凤根廖文星周勇京
Owner GANZHOU ACHTECK TOOL TECH
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